Add frontend build to Python packaging. Remove dead code, cleanup.

pyproject.toml

@@ -40,20 +40,18 @@ dev = [
     "ruff",
 ]
 
-[tool.hatchling]
-# Build frontend
-pre_build = "npm run build --prefix cista-front"
-
 [tool.hatch.version]
 source = "vcs"
 
 [tool.hatch.build]
+artifacts = ["cista/wwwroot"]
+hooks.custom.path = "scripts/build-frontend.py"
 hooks.vcs.version-file = "cista/_version.py"
 hooks.vcs.template = """
 # This file is automatically generated by hatch build.
 __version__ = {version!r}
 """
-
+only-packages = true
 targets.sdist.include = [
     "/cista",
 ]